050913-F-3849M-001 Tech. Sgt. Jim Graves (left) and Staff Sgt. Tom Kocis, aerial spray maintenance technicians with the 910th Aircraft Maintenance Squadron, check recirculation valves during a pre-flight inspection of the Modular Aerial Spray System Sept. 13. ( Air Force photo by Tech. Sgt. Shawn David McCowan)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: air, airforce, force, military, states, united, usa